在Python中使用smtpd库编写支持批量邮件发送的SMTP服务器

在Python中使用smtpd库编写支持批量邮件发送的SMTP服务器可以轻松实现发送大量邮件的需求。下面是一个使用例子，其中包括了服务器的启动、接收邮件、和批量发送邮件的过程。

import smtpd
import asyncore
from email.mime.text import MIMEText
from email.header import Header
import smtplib

# 自定义SMTP服务器类
class CustomSMTPServer(smtpd.SMTPServer):
    def process_message(self, peer, mailfrom, rcpttos, data):
        # 解析邮件内容
        msg = str(data, 'utf-8')
        lines = msg.split('
')
        subject = lines[0][9:].strip()
        content = '
'.join(lines[1:]).strip()

        # 发送邮件
        self.send_email(subject, content, rcpttos)

    def send_email(self, subject, content, rcpttos):
        # 设置邮件内容
        msg = MIMEText(content, 'plain', 'utf-8')
        msg['Subject'] = Header(subject, 'utf-8')

        # 连接SMTP服务器并发送邮件
        with smtplib.SMTP('smtp.example.com', 25) as server:
            # 假设SMTP服务器需要认证
            server.login('username', 'password')
            for rcptto in rcpttos:
                msg['From'] = 'sender@example.com'
                msg['To'] = rcptto
                server.sendmail('sender@example.com', rcptto, msg.as_string())


# 启动SMTP服务器
def start_server():
    # 监听本地端口
    server = CustomSMTPServer(('localhost', 25), None)
    print('SMTP Server Started')
    try:
        asyncore.loop()
    except KeyboardInterrupt:
        server.close()


# 批量发送邮件
def send_bulk_email(subject, content, recipients):
    # 连接SMTP服务器并发送邮件
    with smtplib.SMTP('smtp.example.com', 25) as server:
        # 假设SMTP服务器需要认证
        server.login('username', 'password')
        for rcptto in recipients:
            msg = MIMEText(content, 'plain', 'utf-8')
            msg['Subject'] = Header(subject, 'utf-8')
            msg['From'] = 'sender@example.com'
            msg['To'] = rcptto
            server.sendmail('sender@example.com', rcptto, msg.as_string())
    print('Bulk email sent successfully')


# 启动SMTP服务器
start_server()

# 批量发送邮件
subject = 'Test Subject'
content = 'Test Content'
recipients = ['recipient1@example.com', 'recipient2@example.com', 'recipient3@example.com']
send_bulk_email(subject, content, recipients)

以上是一个基本的例子，你可以根据实际需求进行扩展和修改。请确保替换smtp.example.com、username和password为你的SMTP服务器的相关信息。